Relax your eyes until you see a fourth image appear. Depending on whether  you  cross or separate your eyes, one of the two images in the middle will be the correct 3D image and the other middle image will be the opposite direction 3D.

Image of microprint by a laser jet printer, on 20lb paper.
Note how the toner particles penetrate throughout the fibers. Objective 20x. (Photomicrography by Dr. Gary L. Greenberg)

     

3D Reflected Light
Photomicrograph of microtype laser printing on paper, using reflected incident lighting. Note the toner particles interlaced around the paper fibers. Mag. 50x (Photomicrography by Dr. Gary L. Greenberg)